Dynamo-electric machine.



PATENTED DEG.18. 1906."

B.A. BEHRBND. DYNAMO ELECTRIC MACHINE.

AP?LIOATIOH 1ILED MAB. 26,1906.

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' UNITED sTA'pEs PATENT oFFioE.

BERNARD A. BEHREND, OF NORWOOD, OHIO, ASSIGNOR TO ALLIS- OHALMERSCOMPANY, A CORPORATION OF NEW JERSEY, AND THE BULLOCK ELECTRIC MANUFAOTURING COMPANY, A COR- PORATION OF OHIO.

DYNAlVlO-ELECTFHC MACHINE.

Specification of Letters Patent.

Patented Dec. 18, 1906.

Application filed March 26,1906. Serial No. 308,130.

To all whom it may concern:

Be it known that I, BERNARD ARTHUR BEHREND, a citizen of the UnitedStates, residing at N orwood, in the county of Hamiltonand State ofOhio, have invented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a full, clear, and exactspecification.

My invention relates to dynamo-electric machines, and particularly tothe means for retaining the conductors in open slots in laminatedstationary or rotary cores.

The cores of dynamo-electric machines, both of the rotary and stationarymembers, usually consist of laminae, which are arranged in groups, thegroups being spaced apart by ventilating segments or separators. Theseparators are usually provided with spacingribs, which not only holdthe groups of laminae predetermined distances apart, but in the rotarycores act as fan-vanes to create an outward flow of air to cool not onlythe core and coils of the rotor, but also the core and coils of thestator. If the core is provided at its periphery with open slots for thereception of conductors, the latter are held in place by socalled sticksorwedges of non-magnetic material, which engage grooves at the outerends of the teeth. Usually the depths of the grooves which receive thewedges are small as compared with the width of the teeth measuredcircumferentially, or the distance between adjacent slots. In somemachines, however, the slots are very closely arranged, leaving narrowteeth. The result is that the grooves for the wedges on the oppositeside of each tooth closely approach each other, and when the wedges arein place only a very narrow opening is left between the wedges. It isseen that in this construction if the ordinary coil-retaining wedges areemployed the outward circulation of air is seriously interfered with.

The object of my invention is to provide coil-retaining wedges for coresin which the slots are closely arranged, which will not interfere withthe flow of air in the ventilatingspaces.

In carrying out my invention I- provide coil-retaining wedges in whichthe portions bridging the ventilating-spaces are of less width than theremaining portions. The

width of the wedges at the ventilating-spaces is preferably lessthan'the width of the slots, so that the wedges do not in the slightestdegree restrict the size of the ventilating-openings in the periphery ofthe core nor interfere with the outward flow of air.

For a better understanding of my invention reference is had to theaccompanying drawings, in which Figure 1 is a partial verticaltransverse section through the core of a rotor, the section being takenthrough the ventilating passage-way; Fig. 2 is a plan view of a smallportion of the core, and Fig. 3 is an elevation of one of thecoil-retaining wedges.

I have illustrated my invention as applied to a rotary member but it isto be understood that it may be applied with equal advantage to the coreof the stator. Mounted on the shaft 10 are the core-laminae 11.

, These laminae are, as in the usual construction, arranged in groups,which are spaced apart by separators 12, forming circumferentialventilating passage-ways 13. The groups are held apart by the radialribs 14:, which act as fanblades in the rotary cores to createair-currents, which pass radially outward, cooling both the rotor andthe stator. The periphery of the core is provided with closelyarrangedopen slots 15., leaving teeth 16, which are narrow measured in acircumferential direction, or, in other words, leaving very short spacesbetween the slots. The ribs ld'extend outward almost to the ends of theteeth, so that the latter are well braced. Located in the slots are theusual coil-conductors 17, which are well insulated, as shown, and areretained in place by non-mag netic wedges 18 of peculiar construction,which wedges engage grooves or slots 19 near the outer ends of theteeth.

In the usual machines in which the slots are comparatively far apart thedepth of the grooves which are engaged by the wedges is small ascompared with the space between the slots or the width of the teeth. Inthose machines, however, in which the slots of the cores are closelyarranged, as in the core shown in the drawings, the wedge-retaininggrooves on the opposite sides of each tooth closely approach each other,leaving a comparatively narrow opening between the coilwedges when theparts are assembled. If in. such machines the ordinary wedges, whichhave a uniform width throughout their length, were employed, theventilating-openings at the periphery of the core would be very muchrestricted. The ventilating passage-ways are further restricted by theouter ends of the ribs 14 of the spacing members, which ribs, as isshown in Fig. 1, extend outward between the wedges 18.

In order that I may obtain a free How of air through the passage-ways inthe core, I provide coil-retaining wedges or sticks, having notched orcut-away portions 20 at each side, which notched portions, when thewedges are in place, occur at the ventilatingspaces. Thus the portionsof the wedges which bridge the ventilating-spaces are of less width thanthe remaining portions which engage the grooves. The width of the wedgesat the ventilating-spaces should be not greater than the width of theslot, and I prefer to make the width of the wedges at these points lessthan the width of the slots, as is shown in the drawings.

WVith this construction it is seen that no matter how closely the slotsare arranged nor how deep the Madge-retaining slots are made the outwardflow of air through the ventilating-spaces is not restricted to theslightest degree by the coil-retaining wedges.

I aim in my claims to cover all modifications which do not involve adeparture from the spirit and scope of my invention.

that I claim as new, and desire to secure by Letters Patent, is

1. In a dynamo-electric machine, comprising a laminated core, the lamimebeing arranged in groups spaced apart forming ventilating-spaces andhaving peripheral slots and teeth, coils in said slots, andcoil-retaining sticks or wedges engaging grooves in the outer ends ofthe teeth, the portions of the sticks or wedges bridging theventilating-spaces being of less width than the remaining portions.

2. In a dynamo-electric machine, a core having circumferentialventilating-spaces, and peripheral slots and teeth, means for creating.an outward flow of air through the ventilating-spaces, conductors in theslots of the core, grooves at the outer ends of the teeth for receivingcoil-retaining wedges, and wedges in said grooves, the portions of thewedges bridging the ventilating-spaces being of less width than theremaining portions so as not to interfere with the outward flow of air.

3. In a dynamo-electric machine, a laminated armature, the laminae beingarranged in. groups, ventilating-segments between the groups to hold thelatter apart so as to permit an outward flow of air through the spacesbetween the groups, said core having closelyarranged peripheral slotsforming teeth, the teeth having grooves near their outer end, conductorsin said notches, and means for retaining said conductors in placecomprising wedges engaging the grooves at the'outer ends of the teeth,the portions of the wedges over the ventilating-spaces being notched orcut away so as not to interfere with the outward l low of air.

l. A rotary armature, consisting of lamina: arranged in groups,separators or spacers between the groups, said separators having radialribs for holding the groups predetermined distances apart to formventilating passage-ways and for creating an outward flow of air throughthe passage-ways, said lamime having closely-arranged open slots andteeth, said teeth having undercut portions near their outer ends formingwhen assembled grooves, coils in said slots, and means for retainingsaid coils in place comprising wedges having portions engaging thegrooves in. the teeth, the portions of the wedges bridging theventilating-spaces having a width not greater than the width of theslots.

In a dynamo-electric machine, a core comprising laminae arranged ingroups, means for spacing apart the groups of lami me, said core havingclosely-arranged pcripheral open slots forming narrow teeth, coils insaid slots, and means for retaining the coils in place comprising wedgesor sticks engaging grooves at the outer ends of the teeth, the portionsof the wedges or sticks bridging the ventilating-spaces being of lesswidth than. the width. of the slots.

In testimony whereof I atlix my signature in the presence of twowitnesses.

BERNARD A. BEHREND.

itnesses ARTHUR F. Kwrs, FRED J. KINsEY.

